for deliver or maintenance people please make sure his or her identity before open the door but the safety lock is closed this should especially taken care by the old and the children
对于送货或维修人员，请在开门前确认其身份，但安全锁是关闭的，这应特别注意老人和儿童
以上为机器翻译结果，长、整句建议使用 人工翻译 。